Dental syringe



March 13, 1951 SON 2,545,115

DENTAL SYRINGE Filed March 9, 1950 1 7 i- M /g I /7 6 ,7 4 /4 A? E;:| /Zin A2 L L I I f A z.

INVEN TOR.

' UNITED STATES DENTAL SYRINGE Anthony J. Son, Boston, Mass., assignortoSonco, e

Inc., Mattapan, Mass.

chusetts a corporation of Massa- I Application March 9, 1950,S'erial-No. 1 4s,551

3 Claims. (01. 128-215) This invention relates .tosubcutaneousinjectioninstruments and more especially to those of the type commonly known asdental syringes.

One object of the invention is to provide means near the forward end ofthe needle for pushing the cheek or the tongue of the patient away fromthe needle when an injection is to be made in the outer or the innersurface of the gum, respectively, in order that the dentist may betterlocate the exact point at which the injection is to be made.

Another object is the provision of means for bending the forward portionof the needle with respect to the axis of the syringe when the injectionis to be made on the inner surface of the um.

With these and other objects in view, my invention consists of the novelfeatures, parts, and combination of parts, which are particularlydescribed in connection with the accompanying drawings illustrating adental needle that has given good results in practice.

To attain these objects, I provide a needle guard rod member adjustablysecured to an adapter which locks the needle to the syringe, therearward portion of said rod member being parallel to the axis of theneedle and spaced away therefrom and the forward portion thereof beingcurved with respect to said axis to provide a curved shoulder whichaffords a tongue or cheek pushing member ofi-set from the needle point.The rod member preferably terminates in a needie-stiffening sleevehaving a penetration-governing button on its forward end.

In the drawings accompanying and forming a part of this specification,

Figure 1 is a, side elevation of a dental syringe embodying myinvention, and

Fig. 2 is a side elevation of a modification.

In the particular drawings selected for more fully disclosing myinvention and the principles of the same, said drawings to be consideredas illustrative, mere y, and not restrictive, I is a syringe body of theusual type which holds the ampule (not shown) which the inner end of theneedle H penetrates. The adapter I2 is a locking member whereby the hubi3 is secured to the syringe body as described in detail in my PatentNo. 2,484,657, dated October 11, 1949. While such adapter is preferredit is to be understood that any other suitable locking means may beemployed. The rod member I4 is adjustably secured to the locking member,passing through an aperture in the same and held in adjusted position bythe screw 15.

In Fig. 1, the rearward portion of the rod member is parallel tothe-axis of the needle and is spaced away-therefrom," the axis of theneedle being coaxial with the axis of the syringe body. The forward endportion of said rod member has a bore I6 coaxial with the needle forreceiving the latter and terminating in a button I! which governs thepenetration of the needle. The forward end portion of the rod member iscurved with respect to the axis of the needle to provide a curvedshoulder [8 which affords a tongue or check pushing member'oifset fromthe needle point. The curved portion [8 in Figure 1 is designed to pushthe cheek of the patient away from the needle when the injection is tobe made in the outer surface of the gum.

In Fig. 2 the rearward portion of the rod [4 is parallel to the axis ofthe syringe body and to the axis of the lower portion of the needle, andis spaced therefrom. The forward portion of the rod has a compoundcurvature, the outer part l8 thereof being curved with respect to theaxis of the lower portion of the needle to deflect the forward portionof the needle away from its axis and to provide a curved shoulder whichaffords a tongue or cheek pushing member offset from the needle point.This is particu arly useful when the in ection is to be made in theinner surface of the gum. It will be understood, of course, that thesyringe shown in Figure 2 may be used to make an injection in the outersurface of the gum, if desired, and that the syringe shown in Fig. 1,may be used to make an injection in the inner surface of the gum.

Having thus described illustrative embodiments of my invention without,however, limiting the same thereto, various modifications within thepurview of the appended claims being permissible, what I claim anddesire to secure by Letters Patent is:

' 1. A dental syringe com rising in combination, a syringe body, aninjection needle, a locking member interposed between said need e andsaid syringe body, and a rod member adjustably secured to said lockingmember. the rearward portion of said rod member being parallel to theaxis of said needle and spaced away therefrom, the

I forward end portion of said rod member having .with said axis whichaffords a tongue or check pushing member offset from the needle point.

2. A dental syringe comprising in combination, a syringe body, aninjection needle, a locking member interposed between said needle andsaid syringe body, and a rod member adjustably secured to said lockingmember, the rearward portion of said rod member being parallel to theaxis of said needle and spaced away therefrom, the forward end portionof said rod member being curved with respect to the axis of the rearwardportion of the needle, said forward portion of said rod member having abore for receiving the forward end portion of said needle and deflectingthe same away from the axis of the rearward portion thereof, said curvedportion of .said rod member providing a curved shoulder which affords atongue or cheek-pushing member ofiset from the needle point, saidforward end portion of said rod member terminating in apenetrationgoverning button. 7 3. A dental syringe comprising incombination, a syringe body, an iniection needle, 2. locking memberinterposed between said needle and said the needle point.

syringe body, and a rod member adiustably secured to said lockingmember, the rearward portion of said rod member being parallel to theaxis of said needle and spaced away therefrom, the forward end portionof said rod member having a bore for receiving the forward end portionof said needle and a portion of said rod memher being curved withrespect to the axis of the needle to provide a curved shoulder whichaffords a tongue or cheek pushing member offset from ANTHONY J. SON.

. REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

